题目

My teachers suggested that I see a speech specialist (专家) in school. I never really gave much thought to my speech. If other people understood what I was saying, then that was good enough. I didn’t mind repeating myself many times. Before testing me, the speech specialist asked me what I thought of having good speech. I told her I thought it was not important. “Well, when you are in an interview for a job, and they don’t know what you are saying, what are they going to say to you? Nice meeting you, bye,” she said. Maybe good speech was important. I took part in 20-minute c 图所示为滑动变阻器的四种接线方法．把它们分别连接在电路中，当滑片P向右移动时，可使通过滑动变阻器的电流变大的接法是(     )